V. Villena et al., INTERFERON-GAMMA IN 388 IMMUNOCOMPROMISED AND IMMUNOCOMPETENT PATIENTS FOR DIAGNOSING PLEURAL TUBERCULOSIS, The European respiratory journal, 9(12), 1996, pp. 2635-2639
The level of interferon-gamma (IFN-gamma) in pleural fluid has been re
ported to be increased in pleural tuberculosis, Nevertheless, its diag
nostic value has not yet been well-established, and immunocompromised
patients have not previously been evaluated, The aim of this study was
to determine the value of the IFN-gamma level in pleural fluid for di
agnosing tuberculous pleurisy in immunocompetent and immunocompromised
patients. Three hundred and eighty eight consecutive patients were st
udied prospectively (73 with tuberculous pleural effusions, including
nine with concurrent human immunodeficiency virus (HIV) infection and
one after Liver transplantation, and 315 with nontuberculous effusions
), IFN-gamma was measured by radioimmunoassay. The sensitivity of the
test, using a 3.7 U . mL(-1) cut-off point, was 0.99 (95% confidence i
nterval (95% CI) 0.93-1.00) and the specificity was 0.98 (95% CI 0.96-
1.00). The sensitivity of the test did not differ in HIV-positive and
HIV-negative patients, Patients with lymphoma, vasculitis or vascular
connective tissue disease did not have abnormal IFN-gamma values. In c
onclusion, the level of interferon-gamma in pleural fluid is a very go
od diagnostic marker of tuberculous pleural effusion, even in immunoco
mpromised patients.